Facebook explains the backbone shutdown behind its global outage on Monday

Illustration by Alex Castro / The Verge

The massive outage that took down Facebook, its associated services (Instagram, WhatsApp, Oculus, Messenger), its platform for businesses, and the company’s own internal network all started with routine maintenance.

According to infrastructure vice president Santosh Janardhan, a command issued during maintenance inadvertently caused a shutdown of the backbone that connects all of Facebook’s data centers, everywhere in the world.

That by itself is bad enough, but as we’ve already explained, the reason you couldn’t use Facebook is that the DNS and BGP routing information pointing to its servers suddenly disappeared. According to Janardhan, that problem was a secondary issue, as Facebook’s DNS servers noted the loss of connection to the…

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